Telephone system



Aug.'19, 1941. F. LUBBERGER 2,252,856

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' All@ 19 1941- A F. LUBBERGER 2,252,856

TELEPHONE SYSTEM Filed Feb. 17, 1939 17 sheets-Sheet 3 INVENTOR.' FRITZ LUBBERGER BY F| 6. s

Aug. 19, 1.941. F. LUBBERGER 52,252,856

TELEPHONE SYSTEM Filed Feb. 1'7, 1939 17 Sheets-Sheet 4 FRITZ I -UBBERGER- BY FIG. 4 .A

Aug. 19, 1941. F. LUBBERGER 2,252,855

Y TELEPHONE SYSTEM 2 Filed Feb. 17, 1939 1'7 Sheets-Sheet 5 stl/a1 stvla! stvc l .Sti/df 2 Bras l fsz 2 INVENTOR.' FRITZ LUBBERGER 'FIGJS j ATTORNEY.

Aug. 19, 1941. F. LuBBl-:RGER

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Aug. 19, 1941. F UBBERGERA 2,252,856

TELEPHONE SYSTEM INVENTOR; FRITZ4 LUBBERGER ATTORNEY Aug. 19, 1941. E UBBEGER 2,252,856

TELEPHONE SYSTEM INVENTOR: FRITZ LUBBERGER Allg, l9, 19.421- F. LUBBERGl-:R v 2,252,856 l TELEPHONE SYSTEM Filed Feb. 17, 1939l 17 Sheets-Sheet ll FRITZ I UBBERGER ATTORNEY.

F. LUBBERGER TELEPHONE SYSTEM Aug. 19, 1941.

17 Sheets-Sheet 13 Filed Feb. 1v, 1939 Ang. 19, 1941. F, UBBERGER 2,252,856

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Aug. 19, 1941'.

F. LUB'B-ERGER TELEPHONE SYSTEM l F11-ed Feb. 17, 19:59

17 Sheets-Sheet l5 cm2 I YZL $775 `INVENTOR- FRITZ I UBBERGER ATTORNEY.

Aug. 19, 1941.

F. LUBBERGER 2,252,856

TELEPHONE SYSTEM Filed Feb. 17, 1939 lv'sheets-sheet 16 Ir?" "1 gv 4.a.w I CJ INVENTOR- FRITZ LUBBERGER BY F|e.|6

ATTORNEYLW Aug. 19, 1941. F. LBBERGER 2,252,856

TELEPHONE SYSTEM FRITZ LUBBERGER A TTORNEY.

lvided which operate together.

a Patented Aug .119,1941

TELEPHONE SYSTEM Fritz Lubberger, Berlin-Grunewald; Germany,

assigner to Fides Gesellschaft iur die Verwaltung und Verwertung von gewerblichen Schutzrechten m. b. H., Berlin, Germany Application February'l'l, 1939, Serial No. 256,979

. In Germany February 18, 1938 18 Claims.

The present invention relates to a system having separate setting and talking paths in which in spite of reduction. in-expense on switch means a considerable number of alternative connecting paths are available andthe number of possiblel Further,

simultaneous conversations is large.V the system can deal with a very large number of simultaneous conversations without requiring the provision of complex switching devices for this purpose.

According to theV invention large-group selectors are provided having several access means each arranged common to the outgoing lines over which the normal speech tratlic is extended thus using a simple vmethod whereby several conversations can extend over this selector at the., same time.

The talking path selectors are arranged to be co-ordinate selectors such as are described for example, in the book entitled Die Fernsprechanlagen mit Whlerbetrieb (Automische Telephonie) by `Lubberger, published by R. Oldenbourg of Munich and Berlin, 1935 edition, Figs. 43 and 121. Instead of these co- .ordinate selectors other selectors can of course be used which in their construction permit of the provision of a number of incoming and outgoing lines for one selector the incoming lines having access to all outgoing lines, and in which in the case of an existing connection between an incoming line and an outgoing line other incoming lines of the same selector can still be connected with outgoing lines selectively or by impulse selection.

The principal feature of the invention lies in the fact that two circuit arrangements are pro- The setting path of one arrangement impulses the desired junction line on the reception of impulse trains sent out from the calling station and the setting path of the second circuit arrangement seizes a talking path selector, in the impulse selecting section of the talking path to be completed, which is arranged to have a plurality of incoming lines and a plurality of outgoing lines accessible to these incoming lines. The second circuit arrangement also undertakes the switching through of a seized incoming line to an outgoing line of the selector in the direction necessary to set up the talking path between the calling station and the required station which has been obtained by means of impulses. i l

By providing the setting path for receiving the subscriber's number in order to select the desired station, special storage means to store the impulse trains sent out from the calling station are dispensed with. By the provision of individual paths for lay-passing each large-group selector of the talking `path it is possible to use the talkingselector for several connections in a simple manner since each individual setting path after the 'setting up of a connection between an'outgoing line and an incoming line of the talking seledtor is ready for setting up a further connection over other incoming and outgoing lines oi the same talking selector. These setting paths can be arranged to be very simple as in the present arrangement, since by dispensing with the storage of subscribers numbers special impulse and preparing circuits extending from the storage device for each selecting stagev of the talking or setting path need not be provided.

A further feature of the invention consists in the provision of numbered and unnumbered outgoing lines'in connection with the large-group selectors in the group selecting section of the.

` talking path. Free un-numbered outgoing lines are pre-arranged to be made available to the incoming lines to the selector when `required numbered outgoing lines are engaged. These unnumbered outgoing lines are at the disposal of an incoming line to a selector when one or all of the various numbered outgoing lines are engaged.

The operating periods of the individual selectors by-passing the individual talking selectors' are independent of the impulse transmission from the calling station insofar as their time sequences are concerned, since they are'automatically set, corresponding to the marking of a general station serving to set up the talking connection at which the setting and talking paths separate.

.In the embodiment described co-ordinate selectors ofthe kind shown in Fig. 43a of the previously mentioned book by Lubberger are used as the talking selectors. 'I'hese selectors have a plurality of horizontal bare wire multiples accompanying drawings.

of 20 lines.

, corresponding to the amount of traine over the section -in which the selector is used. Each of the bridge multiples is served by associated bridge magnets with a bridge by whose operation as many spring contacts of the bridge multiples are prepared and operated as there are rod multiples in the selector. The rod multiples of the selector are indicated .by horizontal lines in the EachA selector is provided with rod multiples which are controlled by 5 rods with the aid of 10 rod magnets. Each rod is turned to one or the other side by one of two rod magnets so that by each rod up to different multiples are prepared for use, corresponding to the number of bridges. Since each of the vertical bridges and each of the horizontal rods of the selector can be operated separate, it is possible i to extend several connections over such` a selector at the same time, and actually when there are 10 horizontal 4multiples and l0 vertical multiples, 10 connections can be set up at the same time. If a selector has 2O associated bridges then 10 incoming lines to the horizontal multiple eld of the selector can be connected with 10 outgoing lines on the bridge multiples of the selector so that each rod multiple has a selection The connection'of the incoming and outgoing lines can take place in such a. manner that the incoming lines are connected to the bridge multiple and the outgoing lines are connected to the rod multiples.

When the selector is taken into use a rod controlling a rod multiple is first turned and then a bridge magnet is energised. In this way the spring contacts at the intersection of the cor- 7 responding rods and bridges-are operated" and remain operated after the rod has been rotated back.

The 'present invention 4accordingly concerns the circuits for operating particular rod and bridge magnets.

Figs. l1 and 2 show a trunking scheme for the setting up of a particular connection accordingl to the invention.

The remaining figures illustrate more fully the 'specific circuits outlined in the trunking scheme,

as follows:

Figs. 3 and 4 show the subscribers stations and the rst preselectors of the system,

Fig. 5 shows the incoming second preselectors, Fig. 6 showsthe outgoing second preselectors, Fig. 'I shows a feeding bridge, a seizing switch therefor and a rst selector in the setting path, Fig. 8 shows .a final selector in the speaking path and the control switch therefor,

Figs. 9 and 10 show a rst selector in .the speaking path and the control switch therefor, y

Fig. 11 shows a second selector in the speaking path,

Fig. 12 shows an auxiliary group selector in the speaking path and the controlswitch thereall terminate at 8000 bridge multiples of the first preselectors.

The grouping of the individual selectors can now be arranged so that each selector is considered as a frame or several selectors together forming a frame. By connecting the rod multiples of the individual selector together, selector .frames of up to 100 bridge multiples can be formed. Thus series or parallel circuits for Ythe corresponding rod magnets can be obtained in known manner. If, however, the individual selector frames each comprise 80 bridges (80 subscribers lines)' then 4 preselectors must be arranged in the frame with' the rod magnets of these four preselectors connected one with the other. In Fig. 1 such an arrangement of a pre-` selector frame is indicated diagrammatically and the preselectors IVWa and IVWb represent two connected selectors of thekind Whose rod multiples are connected by jumpers V. Selectors with a large number ofy bridges 'can also be connected-together. In this case however, the control rods are increased in length since they must then extend over the space taken by 80 bridge multiples. g

A connection between the subscribers set A (No. 1234) and the subscribers set E (No. '7629) extends as follows: when the subscriber at the 'set 1234 lifts up his receiver a free rod multipling which extends over the selectors IVWa, IVWb is first prepared in that the rod magnet for the corresponding rods is energised. In this way a free access is determined extending to the -line esmall circle are closed. The bridge magnet remains energised so long as the rod magnets are not connected. It is not necessary to energise the rod magnets in both selectors but it suffices 4only to energise a single rod magnet of the selector IVWa since the calling line is connected to a bridge multiple in this selector. This is however,

dependent on the arrangement ofthe impulse circuit.

The line outgoingfrom the rod multiple Ist of the selectors IVWa and IVWb has access to the two bridge multiples over contact ul and actually to a bridge multiple (1Gb) in the outgoing second preselector IIVab3 and to a bridge-multiple (15b) in the incoming second preselector IIVWa'nS. Since the presen*I case concerns the setting up of an outgoing connection the connection over the contact ul in its normal position is set up with the bridge 16h of the selector IIVWab3. The connection extends over the rod multiple 13st to the feeding bridge Spll3. The feeding bridge supplies the feeding current for the calling subscriber at the subscribers station 1234. It has separate condensers and a feeding bridge for the incoming side (subscriber 7629).,

Further the calling apparatus for the calling subscriber is arranged in the feeding bridge, and the feeding bridge Spi I3 also serves as an impulse bridge.

The 8000 bridge multiples of the subscriber are connected to first preselectors or first preselector frames each having 10 outgoing lines, i. e. providing 1000 outgoing lines in all. These outgoing lines lead to 1000.0utgoing and 1000 incoming bridge multiples in the second preselector. In the second preselector stage v40 incoming and 40 outgoing co-ordinate selectors are provided. Each of these selectors has 25 bridge multiples.

2,252,856 Accordingly since each selector has rod mulmaintained in the switch mechanism ABW not shown in detail. The finder switch AS connects the setting path and consists of a normal up and around selector.

The calling subscriber obtains dial tone from the first group selector of the setting path. This is indicated by EIGW. 'Ihe calling subscriber now sets the first group selector EIGW, the second group selector EIIGW and the final selector ELW in known manner, by dialling the number 7629 of the required set E in known mani ner.. After setting the final selector ELW the .impulsing of the bridge multiple indicated by |0417 of the subscriber 7629 connected in the first preselector IVWe takes place. A free rod multiple of the preselector IVWe is prepared, for example the rod multiple which is indicated in Fig. l by 92st. The contact n3 is operated and con- 'nects abridge multiple in an incoming second preselector (IIVWan2). The seized bridge multiple is indicated in Fig. 1 in the preselector IIVWanZ by 2Gb.' A free rod multiple is impulsed, for example rod multiple 12st which over line LH has access to the rod multiple Sist of the group selector IGW. The number of this multiple. for example 3|5 is not of essential importance.

The talking path consists' of three selector stages IGW, IIGW, LW each of which receive a digit. The 40 incoming second preselectors have access to 400 outgoing lines since each of these has 10 rod multiples, which outgoing lines lead to 400 rod multiples of the first group selectors. The rod multiple used i'n the described connection is indicated by SI5. The system `represented requires 40 first group selectors with from 13 to 1 bridge multiples. i

In the first group selector the connection to a feeding `bridge of the feeding bridge group |00 to |99, namely to the feeding lbridge indicated by |I3 is to be set up. A marking selector IBZ associated with the group selector IGW rotates after the seizing of the rod multiple still of the group selector IGW. In this way impulses are passed over the setting path back to the seizing mechanism, ABW on the finder switch AS. On 4 the first rotation the seizing -switch finds the first digit namely the digit l of the feeding bridge characterising digit 113 and thus the marking selector IBZ is held in position l. The setting I of the wiper azI of the marking selector IBZ leads to 2 bridge multiples of the group selector IGW which are connected to groups |00 to |99 of the feeding bridges. A connection between these bridges results at the contact brI. When the left bridge multiple is free the bridge magnet is operated so that4 the connection extends over the coupling point of the selector IGW indicated by means of a small circle. In this way the connection is switched through over the line L22 to a rod multiple of the second group selector IIGW. The marking selector IBZ is free to set up another connection. lA connection 7 I y i i which is also connected from an incoming second preselector to a rod multiple of the/first group selector must only wait until the marking selector IBZ which is associated with the group selector is freed from the previous connection. Since the marking selector after the switching through of the coupling point immediately travels back to its normal position and then is ready for setting up a connection immediately. only `a verysmaii waiting period is necessary. 'I'he sending out of impulses on the part of the seizing mechanism (ABW) only begins when it is seton a marking selector in its home position. 1

The arrangement of the second group selector is precisely the same as that of the first group selector.V After the seizing of one of the rod multiples thelmarking selector DBZ is connected when-free' and then together with the seizing switch ABW determines the second digit (l) of the number (113) of the feeding bridge SpII3. The left bridge multiple of the second group selector (IIGW) is connected to a'line indicated by the numbers IIIi to IIS over which theconnection is extended to a bridge multiple in the final selector whose rod multiples are connected with the feeding bridges indicated by H0 to IIS. In the final selector the marking selector (IIIBZ) is connected. This in conjunction with the seizing switch ABW determines the third digit 3 of thefnumber of the feeding bridge Spii. The rod magnet of the rod `multiple IISst and the bridge magnet of the seized bridge multiple to the bridge 89h are then energised,

the selector IIIBZ is freed and the rod magnet of the rod multiple I|3st is released. The required line '7629 is connected to thefeeding bridge Spi I3 seized by the subscribers line 1234. Current then flows to the subscribers station 7629 the setting path over the up-and-around selector is released.

Auxiliary group selectors IHGW and IIHGW shown in Fig. 2 are arranged as follows: Each of the 40 first group selectors can serve 10 connections as each of these selectors has 10 rod multiples associated with it. From each group 'selector of the first group selecting stage however only two paths lead to each4 100s group of the feeding bridge as for example; two lines to the feeding group |00 to |99, two lines to the feedingA bridging group 200 to 299, etc. In order however to increase the number of these paths assuming that the paths not sufficient to Vdeal with the traffic "present and that more than two paths are to be extended to a s group of the feeding bridge, each group selector can be Aprovided with further bridge multiples which are Anot numbered in addition tothe eight numbered bridge multiples. These are indicated on the selector IGW in Fig. 2 by 12500 to 17504. In the first group selector, not shown, live sets-of unnumbered bridge multiples are included it being understood that there can be more or fewer than these.

When, for example, a third connection is extended to the bridge |00 to |99 the marking selector IBZ first determines that both bridge multiples indicated by |00 to |99 are seized. An impulse is then transmitted over the second arm bzl of the indicating selector IBZ to the contacts IcI, k2, k3, k4. Ihis contact chain is set on the first free bridge multiple of the multiple extension on the selector IGW. l This extension field accordingly carries out thefunction of a third pre-selecting stage. In Fig. 2V this extension field is indicated by IIIVW. Over a bridge multiple of this exten- 

